Wherever you do it, pls don't attach the ropes as this guy did.
The whole weight of the person is being supported on the armrests, which were never designed to handle anything close to the load, and may come off at any moment! I'd suggest enlisting the help of someone competent, and taking plenty of safety precautions!
TS is looking for the location not the chair swing itself. You might wanna look for a building behind iTE tampines, beside a big drain thing sized like a soccer field. The building looks abandon because the back of that building is half gone so I suppose it's deserted. I have not really went in though, if I Passby again I might go Check it out.